If you want to use flash your best chances of success are to get it off camera. I used a couple of flash accessories to get this shot, first I used a set of pocket wizards, which send the flash signal wirelessly. The flash had a flash xtender on it, this magnifies and focuses the beam further away. Lastly I had someone hold the flash and point it in the right direction. I set the flash to full power, my f stop as low as it would go, shutter speed to 100th of a second. I then started adjusting the iso on the camera to get the correct exposure. Sounds pretty easy doesn’t it?